I think you'll find that you haven't had a direct answer because its very difficult to do so in a situation where personal skill is involved.
I mean, for example, you asked 'how do you know when its going fast enough to take off?' That is almost impossible to answer in the written word.
It should be going this speed :- (< >)
(that is, 32.56767 mph)
(approximately)
Did that help?
However, they are all excellent questions that will be answered the moment you actually try it. You will 'feel' that a speed is enough to take off when you see it, after a bit of experience.
As with any skill, its almost impossible to correspond with somebody and get solutions.
Don't let that put you off though! It's a great hobby, full of people who are willing to help in any way possible.
If you need to find out where your local club is, try the AMA website, or, this one is a good start:-
http://www.hobbypeople.net/rcsource/link/plane012.htm
-David C.